All farms require a farm location on the map. If creating or editing a farms details a map is shown for selecting the farms location.
In most cases the location will default to the entered farm address. If this is not the location of the farm, the marker that is on the map can be dragged to the farms location.
The location on the map should be at the point that best represents where the farm is located. This would most often be in the center of the farm.